Tire-making drum

Abstract

Abstract This tire-making drum intended notably for machines of the type utilized for making conventional or radial-ply heavy truck tires comprises on either side an assembly surrounding an axial spindle, each assembly comprising an annular sleeve rigid with the spindle and formed with end radial extensions forming with said sleeve and an annular cam member slidable mounted on said sleeve a variable-capacity chamber connected to a source of fluid under pressure. One extension of said sleeve it strapshaped and has pivoted thereon a double-crank lever carrying on its first elbow a roller engaging a tapered outer face of said annular cam member, all the outermost rectilinear segments of the two opposite sets of levers are covered by a resilient membrane reinforced by inner blades and transverse members. Spring means urge the annular members symmetrically towards each other and towards the median plant of the drum. When these annular cam members are in their innermost position, i.e. close to said median plane, said chambers have zero capacity and the membrane has its maximum diameter; introducing pressure fluid into these chambers will move the annular cam members to their outermost position in which the membrane has its smallest diameter. The members reinforcing said resilient membrane are adapted to engage corresponding grooves formed in the outer surfaces of said outermost rectilinear segments of the double- crank levers.

Inventors

• 👤 G Gazuit

Bibliographic Details